Installation Guide
DANFOSS
M27F0009
Solenoid valves, two-step on/off
PMLX (NC/NO) 80-125
027R9521
Closed
027R9521
Step 1,
open
Step 2,
open
Fig. 1
Fig. 2
Pos.
item
a 50
b 65
c 25
d 140
g 75 80 125
i 9
k 25 40 60
l 45 60 90
m 150 220 310
Fig. 3 Table 1
Nm kpm lbf-ft
10 1 7.4
Tightening Torque in Nm
80 100 125
© Danfoss A/S (RC-MDP/MWA), 2014-05 DKRCI.PI.BR0.B4.02 / 520H4696 1
Fig. 5
Fig. 4
Fig. 7
Fig. 6
Fig. 8
2 DKRCI.PI.BR0.B4.02 / 520H4696 © Danfoss A/S (RC-MDP/MWA), 2014-05
ENGLISH
Installation
Refrigerants
Applicable to HCFC, HFC and R717
(Ammonia).
Flammable hydrocarbons are not
recommended. The valve is only
recommended for use in closed circuits. For
further information please contact Danfoss.
Temperature range
PMLX: –60/+120°C (–76/+248°F)
Pressure range
PMLX: The valves are designed for a max.
working pressure of 28 bar g (406 psi g).
Technical data
PMLX can be used in suction, liquid, hotgas and liquid/vapour lines.
The PMLX regulates the flow of the
medium by two step on/off function,
depending on the control impulse from the
screwed-on pilot valves.
The PMLX has three connections for pilot
valves: two in series, marked “S I” and “S II”,
and one in parallel with these two, marked
“P”, see fig. 3.
Installation
Flange set for the PMLX is delivered
separately. The valve must be installed
with the arrow in the direction of the flow
and the top cover upwards (fig. 1). The top
cover can be rotated 4 X 90° in relation to
the valve body.
The valve is fitted with a spindle for manual
opening.
When an external pilot valve is used, the
pilot line must be connected to the upper
side of the main line so that any dirt and oil
from the plant will not find its way into the
pilot line.
• Make certain that the heat affected zones
(inside and outside) and the mating
surfaces of gasketed joints are free of
debris and rust and are in good condition.
• Use only new gaskets manufactured by
Danfoss.
• Make sure that the bolts are adequately
tightened in an alternating pattern.
• Use only original Danfoss stainless steel
bolts provided with the valve. Stainless
steel bolts offer corrosion protection and
they ensure safe operation across the
design operating range of the valve when
installed properly.
Note: Stainless steel bolts have a
slightly lower yield strength compared
to carbon steel bolts. Be careful not to
over-tighten the bolts.
• Ensure that flanges / valves are properly
pressure tested, leak tested, evacuated
before charging with refrigerant in
accordance with ANSI /IIAR 5, EN378-2 or
ISO 5149-2.
PMLX valves must not be mounted in
systems where the outlet side of the valve
is open to atmosphere. The outlet side of
the valve must always be connected to the
system or properly capped off, for example
with a welded-on end plate.
Colours and identification
The PMLX valves are Zinc-Chromated in the
factory. If further corrosion protection is
required, the valves can be painted.
Precise identification of the valve is made
via the ID plate on the top cover. The
external surface of the valve housing
must be prevented against corrosion
with a suitable protective coating after
installation and assembly.
Protection of the ID plate when repainting
the valve is recommended.
Tightening
Tightening torques
See fig. 3 and table 1.
Use only original Danfoss parts, including
packing glands, O-rings and gaskets for
replacement. Materials of new parts are
certified for the relevant refrigerant.
In cases of doubt, please contact Danfoss.
Danfoss accepts no responsibility for
errors and omissions. Danfoss Industrial
Refrigeration reserves the right to make
changes to products and specifications
without prior notice.
The following text is applicable to the UL
listed products PMLX (NC/NO) 80-125
Applicable to all common non-flammable
refrigerants, including/excluding (+) R717 and
to non-corrosive gases/liquids dependent on
sealing material compatibility (++). The design
pressure shall not be less than the value outlined
in Sec. 9.2 of ANSI/ASHRAE 15 for the refrigerant
used in the system. (+++).
The valve is designed to withstand a high
internal pressure. However, the piping
system should be designed to avoid liquid
traps and reduce the risk of hydraulic
pressure caused by thermal expansion. It
must be ensured that the valve is protected
from pressure transients like “liquid
hammer” in the system.
Mounting of valve flanges
When welding/soldering the flanges to
the system piping use only materials and
welding/soldering methods compatible
with the flange material.
• Make sure that piping into which a valve/
flange is installed is properly supported
and aligned square and plumb to the
joining sections.
• Ensure that the finalized valve assembly is
free of any stresses from external loads.
Maintenance
Service
The PMLX valves are easy to dismantle and
most of its parts are replaceable. When the
bottom cover is removed, the strainer can
be taken out for cleaning.
Do not open the valve while the valve is
still under pressure.
- Check that the O-ring or gaskets have
not been damaged.
- Check that the spindle is free of scratches
and impact marks.
- If the teflon ring has been damaged, the
parts must be replaced.
Assembly
Remove any dirt from the body before the
valve is assembled. Check that all channels
in the valve are not blocked with particles
or similar.
© Danfoss A/S (RC-MDP/MWA), 2014-05 DKRCI.PI.BR0.B4.02 / 520H4696 3
www.danfoss.com/ir
4 DKRCI.PI.BR0.B4.02 / 520H4696 © Danfoss A/S (RC-MDP/MWA), 2014-05
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